--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/firmware/main.c Fri May 12 15:33:22 2017 +0200
@@ -0,0 +1,125 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdlib.h>
+
+uint8_t mode;
+
+void entprellung( volatile uint8_t *port, uint8_t maske ) {
+ uint8_t port_puffer;
+ uint8_t entprellungs_puffer;
+
+ for( entprellungs_puffer=0 ; entprellungs_puffer!=0xff ; ) {
+ entprellungs_puffer<<=1;
+ port_puffer = *port;
+ _delay_us(150);
+ if( (*port & maske) == (port_puffer & maske) )
+ entprellungs_puffer |= 0x01;
+ }
+}
+
+void led(uint8_t n) {
+ // first clear all leds
+ PORTB &= 0b00011101;
+
+ // enable selected led
+ switch (n) {
+ case 1:
+ PORTB |= _BV(1);
+ break;
+ case 2:
+ PORTB |= _BV(5);
+ break;
+ case 3:
+ PORTB |= _BV(6);
+ break;
+ case 4:
+ PORTB |= _BV(7);
+ break;
+ }
+
+}
+
+
+void init(void) {
+ // initialize LED and FET pins
+ DDRB = 0b11101011;
+
+ // DEVELOP: ENABLE PULL-UP ON AVR
+ //PORTD |= ( 1 << PD2 );
+
+
+ TCCR1A = (1<<WGM10)|(1<<COM1A1) // Set up the two Control registers of Timer1.
+ |(1<<COM1B1); // Wave Form Generation is Fast PWM 8 Bit,
+ TCCR1B = (1<<WGM12) // OC1A and OC1B are cleared on compare match
+ |(1<<CS10); // and set at BOTTOM. Clock Prescaler is 1024.
+
+
+ uint8_t i;
+ for(i = 0; i<5; i++) {
+ led(i);
+ _delay_ms(50);
+ }
+
+ for(i = 4; i>mode; i--) {
+ led(i);
+ _delay_ms(50);
+ }
+
+ led(mode);
+ pwm_update();
+}
+
+void pwm_update(void) {
+ PORTB |= _BV(0); // switch on led driver
+
+ switch (mode) {
+ case 1:
+ OCR1A = 63; // Dutycycle of OC1A = 25%
+ break;
+ case 2:
+ OCR1A = 127; // Dutycycle of OC1A = 50%
+ break;
+ case 3:
+ OCR1A = 189; // Dutycycle of OC1A = 75%
+ break;
+ case 4:
+ OCR1A = 255; // Dutycycle of OC1A = 100%
+ break;
+ default:
+ // switch off pwm and driver
+ OCR1A = 0;
+ PORTB &= _BV(0);
+ }
+}
+
+
+void main(void) {
+
+ mode = 1;
+ uint8_t key_last = _BV(2);
+ uint8_t tmp;
+
+ init();
+
+ while (1) { /* main event loop */
+
+ entprellung( &PIND, _BV(2) );
+ tmp = PIND & _BV(2);
+ if (tmp != key_last) {
+ key_last = tmp;
+ if (tmp) {
+ if (mode < 4) {
+ mode++;
+ } else {
+ mode = 1;
+ }
+ led(mode);
+ pwm_update();
+ _delay_ms(50);
+ _delay_ms(50);
+ }
+ }
+
+ }
+
+}
\ No newline at end of file